/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso.channel;

import org.jpos.iso.*;

import java.io.IOException;
import java.net.ServerSocket;

/**
 * ISOChannel implementation - RAW Channel
 * Send packet len (4 bytes network byte order) followed by
 * raw data. Usefull when you need to send propietary headers
 * with ISOMsgs (such as NAC's TPDUs)
 *
 * @author apr@cs.com.uy
 * @version $Id$
 * @see ISOMsg
 * @see ISOException
 * @see ISOChannel
 */
public class RawChannel extends BaseChannel {
	/**
	 * Public constructor (used by Class.forName("...").newInstance())
	 */
	public RawChannel() {
		super();
	}

	/**
	 * Construct client ISOChannel
	 *
	 * @param host   server TCP Address
	 * @param port   server port number
	 * @param p      an ISOPackager
	 * @param header an optional raw header (i.e. TPDU)
	 * @see ISOPackager
	 */
	public RawChannel(String host, int port, ISOPackager p, byte[] header) {
		super(host, port, p);
		this.header = header;
	}

	/**
	 * Construct server ISOChannel
	 *
	 * @param p      an ISOPackager
	 * @param header an optional raw header (i.e. TPDU)
	 * @throws IOException
	 * @see ISOPackager
	 */
	public RawChannel(ISOPackager p, byte[] header) throws IOException {
		super(p);
		this.header = header;
	}

	/**
	 * constructs a server ISOChannel associated with a Server Socket
	 *
	 * @param p            an ISOPackager
	 * @param header       an optional raw header (i.e. TPDU)
	 * @param serverSocket where to accept a connection
	 * @throws IOException
	 * @see ISOPackager
	 */
	public RawChannel(ISOPackager p, byte[] header, ServerSocket serverSocket)
			throws IOException {
		super(p, serverSocket);
		this.header = header;
	}

	protected void sendMessageLength(int len) throws IOException {
		serverOut.write(len >> 24);
		serverOut.write(len >> 16);
		serverOut.write(len >> 8);
		serverOut.write(len);
	}

	protected int getMessageLength() throws IOException, ISOException {
		byte[] b = new byte[4];
		serverIn.readFully(b, 0, 4);
		return ((int) b[0] & 0xFF) << 24 |
				((int) b[1] & 0xFF) << 16 |
				((int) b[2] & 0xFF) << 8 |
				(int) b[3] & 0xFF;
	}

	/**
	 * New QSP compatible signature (see QSP's ConfigChannel)
	 *
	 * @param header String as seen by QSP
	 */
	public void setHeader(String header) {
		super.setHeader(ISOUtil.str2bcd(header, false));
	}
}
